Q. No.Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
Assertion (A):
Action potential propagation in unmyelinated neurons is faster than in myelinated neurons.
Reason (R):
Myelin is a complex polysaccharide and it slows the conduction of the impulse along the axonal membrane.
In the light of the above statements choose the correct answer from the options given below:
1.
Both (A) and (R) are true and (R) is the correct explanation of (A).
2.
Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.
(A) is true but (R) is false.
4.
Both (A) and (R) are false.
In the light of the above statements choose the correct answer from the options given below:
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | Damage to cerebellum may cause ataxia and dysarthria. |
| Reason (R): | The cerebellum plays an important role in motor control. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | The same neurotransmitter, acetylcholine, may be inhibitory at some places like heart and excitatory elsewhere like alimentary canal. |
| Reason (R): | The cells involved in each case have different receptors for ACh that produce different effects. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | People with extensive, bilateral hippocampal damage may experience anterograde amnesia (the inability to form and retain new memories). |
| Reason (R): | The hippocampus belongs to the limbic system and plays important roles in the consolidation of information from short-term memory to long-term memory. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | Once initiated, the action potential has a magnitude that is independent of the strength of the triggering stimulus. |
| Reason (R): | Action potentials are all or none responses to stimuli. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | The resting membrane potential in a neuron is much closer to the equilibrium potential of K+ ions than it is to equilibrium potential of Na+ ions. |
| Reason (R): | While potassium is the principal cation in the intracellular fluid, sodium is the principal cation in the extracellular fluid. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
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The re-establishment of the resting membrane potential after depolarization is primarily due to:
| 1. Sodium potassium pump | 2. Influx of sodium |
| 3. Efflux of potassium | 4. Efflux of sodium |
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Which of the following parts of the human brain functions as a gateway to the cerebrum and is a major coordinating center for sensory and motor signaling?
| 1. Thalamus | 2. Hypothalamus |
| 3. Corpora quadrigemina | 4. Pons |
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A canal called the cerebral aqueduct passes through the:
| 1. Cerebral hemispheres | 2. Diencephalon |
| 3. Mid brain | 4. Hind brain |
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Consider the two statements:
| I: | Electric synapses are rare in our system. |
| II: | Impulse transmission across electric synapse is always faster than across a chemical synapse. |
1. Both I and II are correct and II explains I
2. Both I and II are correct and II does not explain I
3. Only I is correct
4. Only II is correct
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